/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.iotdb.db.engine.upgrade;

import org.apache.iotdb.commons.file.SystemFileFactory;
import org.apache.iotdb.db.conf.IoTDBConfig;
import org.apache.iotdb.db.conf.IoTDBDescriptor;
import org.apache.iotdb.db.utils.UpgradeUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;

public class UpgradeLog {

    private static final Logger logger = LoggerFactory.getLogger(UpgradeLog.class);

    private static final IoTDBConfig config = IoTDBDescriptor.getInstance().getConfig();
    private static final String UPGRADE_DIR = "upgrade";
    private static final String UPGRADE_LOG_NAME = "upgrade.txt";
    private static BufferedWriter upgradeLogWriter;
    private static File upgradeLogPath =
            SystemFileFactory.INSTANCE.getFile(
                    SystemFileFactory.INSTANCE.getFile(config.getSystemDir(), UPGRADE_DIR), UPGRADE_LOG_NAME);

    public static boolean createUpgradeLog() {
        try {
            if (!upgradeLogPath.getParentFile().exists()) {
                upgradeLogPath.getParentFile().mkdirs();
            }
            upgradeLogPath.createNewFile();
            upgradeLogWriter = new BufferedWriter(new FileWriter(getUpgradeLogPath(), true));
            return true;
        } catch (IOException e) {
            logger.error("meet error when create upgrade log, file path:{}", upgradeLogPath, e);
            return false;
        }
    }

    public static String getUpgradeLogPath() {
        return upgradeLogPath.getAbsolutePath();
    }

    public static boolean writeUpgradeLogFile(String content) {
        UpgradeUtils.getUpgradeLogLock().writeLock().lock();
        try {
            upgradeLogWriter.write(content);
            upgradeLogWriter.newLine();
            upgradeLogWriter.flush();
            return true;
        } catch (IOException e) {
            logger.error("write upgrade log file failed, the log file:{}", getUpgradeLogPath(), e);
            return false;
        } finally {
            UpgradeUtils.getUpgradeLogLock().writeLock().unlock();
        }
    }

    public static void closeLogWriter() {
        try {
            if (upgradeLogWriter != null) {
                upgradeLogWriter.close();
            }
        } catch (IOException e) {
            logger.error("close upgrade log file failed, the log file:{}", getUpgradeLogPath(), e);
        }
    }
}
